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Ready light blinking on a Hot Spring / Watkins hot tub: temperature sensor problem

A blinking green Ready light means there is a problem with the temperature sensor. Check the real water temperature with a thermometer before using the tub.

Also shown as: green light blinking, green ready light flashing, blinking green light

Most likely causes

  1. 1Failed temperature sensormost likely
  2. 2Loose sensor connectioncommon
  3. 3Control board faultless common

What to try, in order

  1. Turn the tub off at the breaker for 30 seconds, then back on.
  2. Check the water temperature with a floating thermometer.
  3. If the green light still blinks, contact your dealer or a technician.

Ready light blinking questions

What should the Ready light normally do?

It is on steadily when the water is within a couple of degrees of the set temperature and off while the tub is heating. Blinking means a sensor fault.

Can I fix a blinking green light myself?

A power reset is the only owner-level step. If it returns, the sensor needs service.

Related codes

Hot Spring / Watkins Power and Ready lights blinking · Low flow through heaterHot Spring / Watkins Power light blinking · Heater high limit tripped

General guidance. Follow your manufacturer's instructions; anything inside the control box is work for a licensed professional. Updated October 5, 2026.